Furnace.



C. KROESGHELL. FURNACE.

APPLICATION mum AUG.10, 1908.

927,861. I Patented July 13, 1909.

2 SHEETS-SHEET l.

fizz M @wkj floeacezza raw a g G. KROESGHELL.

FURNACE.

APPLICATION FILED AUG. 10, 199B.

Patented July 13, 1909.

2 SHEETS-SHEET 2.

UNITED STATES PATENT FFICE.

CHARLES KROESCHELL, OF CHICAGO, ILLINOIS, ASSIGNOR TO KROESCI'IELL BROS. 00., OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

FURNACE Specification of Letters Patent.

Application filed August 10, 1908.

Patented July 13, 1909.

Serial No. 447,722.

T all whom it may concern:

Be it known that I, CHARLES KRoEsenELL, a citizen.of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Furnaces, of which the following is a specification.

My invention relates to an improvement in the class of furnaces for heating water to be used for heating purposes or for generating steam for such use; and it consists in certain details of construction and combinations of parts designed to enhance the efficiency of the furnace.

In the accompanying drawings, Figure 1 is a view of my improved furnace in vertical longitudinal section; Fig. 2 is a section on line 2, Fig. l, and Fig. 3 is a broken section on line 3, Fig. 2.

The construction of furnace shown in the drawings is more particularly designed for green-house use in heating water, though it is adaptable to other purposes.

The foundation A is a brick structure containing the central pier B for sustaining the bridge-wall C. In the top of the pier is a transverse air-duct r communicating at its ends with the outer air.

The furnace-chamber D is constructed in the arch-shape illustrated, of metal, with an inner wall Q and an outer wall 7) forming between them a water-space E having an inlet a in the back of the structure near its base and an outlet 0 in the forward end of its top portion.

A door F is provided at the front of the fuelchamber D formed by a grate G over the ash-pit II and the bridge-wall C rising from a flanged metal plate C sun-mounting the pier B and containing openings m through which the air-passage r co1nmuni cates with the base of a series of vertical air-passages Z formed in the bridge-wall and each terminating in a horizontal outlet Z which opens into the up or part of the back of the lire-chamber. T16 plate C is provided with an extension 7c at the base of its forward flange y forming a seat for the adj acent ends of the grate-bars, the opposite ends of which are supported on an angleiron i at the inner side of the base of the fueldoor opening.

A series of open-ended water-tubes I incline downwardly over the fire-chamber and top of the bridge-wall in the chamber I) and connect the front and rear walls of the waterspace E to permit circulation through the tubes of water in the best position for expediting the heating circulation thereof by the heat of the products of combustion rising from the fire-chamber to envelop the tubes, above which they encounter a baffle-plate K interposed in their course over the tubes adjacent to the stack inlet-opening L. The baffle-plate deflects the hot gases downwardly past the flues behind the bridge-wall to enhance their combustion; and from the space back of the bridge-wall the hot gases rise again between the tubes to escape, in spent condition, through the stack.

The air introduced by way of the passage 7 through the passages Z, Z in the bridge-wall becomes highly heated in the latter and en tering the fuel-chamber D greatly promotes the combustion therein.

If the furnace is used for generating steam, the upper part of the water-space E is proportionately larger than represented to form a steam-space and an ordinary steam-dome (not shown) may be provided at the outlet 0.

What I claim as new, and desire to secure by Letters Patent, is

In a furnace having a fuel chamber, the combination with a bridge-wall foundation formed of masonry and provided with an air duct in its upper end, a flat metal plate resting on said foundation and extending over the open side of the air duct, said plate being formed with openings therethrough and provided with upwardly extending flanges, said plate being also provided with an extension forming a seat for the adjacent ends of the grate-bars, a bridge-wall containing vertical air passages resting upon said plate between the flanges, said air passages in the bridge-wall coinciding with the openings in said plate, and said bridge wall itll' passages discharging into the fuel eha1n CuAs. E. GAYLORD, RALPH A. SCHAEFER. 

